These include Nova Scotia's provincial mineral stilbite, as well as heulandite, analcime, chabazite, gmelinite, natrolite and thomsonite.
12.
PIH has now been demonstrated in natrolites containing monovalent cations as well as in large-pore zeolites, pyrochlores, clays and graphite oxide.
13.
It occurs with kaolinite, gibbsite and diaspore in bauxite deposits; and with nepheline, gibbsite, diaspore, natrolite and analcime in nepheline pegmatites.
14.
It occurs in serpentine altered dolostone in association with skarn enriched in tungsten, strontium, beryllium and boron in the Keralia occurrence and in vugs with natrolite and thomsonite in Norway.
15.
After John Parry and F . E . Wright described the mineral afwillite in 1925, Williams recognized that his samples of bultfonteinite were not natrolite, but were likely a new mineral species.
16.
They are found in serpentine and, especially where the lavas contain nepheline or leucite, are often rich in zeolites, such as analcite, prehnite, natrolite, scolecite, chabazite, heulandite, etc.
17.
It is also found within natrolite veins in glaucophane schist within serpentinite in San Benito County, California, US . It also occurs in Mont Saint-Hilaire, Quebec and in the Kola Peninsula of Russia.
18.
At the same locality it was found in alkaline pegmatite veins associated with clinobarylite, natrolite, aegirine, microcline, catapleiite, fluorapatite, titanite, fluorite, galena, sphalerite, annite, astrophyllite, lorenzenite, labuntsovite-Mn, kuzmenkoite-Mn, cerite-( Ce ), edingtonite, ilmenite and calcite.
19.
Common habits include acicular, which described needlelike crystals like in natrolite, bladed, dendritic ( tree-pattern, common in native copper ), equant, which is typical of garnet, prismatic ( elongated in one direction ), and tabular, which differs from bladed habit in that the former is platy whereas the latter has a defined elongation.
20.
Early physical characterization and initial diffraction experiments in zeolites were followed by the first unequivocal structural characterization of PIH in the small-pore zeolite natrolite ( H 2 O ), which in its fully super-hydrated form, Na 16 Al 16 Si 24 O 80 x 32H 2 O, doubles the amount of water it contains in its pores.
